Itemize your modifications (if you have any). Thats going to be the first thing people ask you when attempting an over-the-internet diagnostic.
This is a discussion on 06 WRX idling and stalling issues within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; My 06 WRX recently is idling strangely... it's a little "jumpy". It'll hold around 700 rpm, then drop to almost ...
My 06 WRX recently is idling strangely... it's a little "jumpy". It'll hold around 700 rpm, then drop to almost nothing, then jump above 1000 as it settles back to around 700 again. It's worse/more noticeable when the climate control is on. Also, it occasionally stalls out at idle, or near idle. The other day it was in neutral, no a/c on, and it just shut off. It stalls out VERY gently, you wouldn't notice with the radio on. I've noticed it does it to me occasionally when I back up and then try to shift into first. Any ideas? I read a couple of the other threads but didn't see anything for an 06/07.
5-speed. No work done on it recently, aside from me changing the oil on it.
Now that I think about it though, the plastic undertray/skidplate thing is missing... would that leave anything vulnerable to damage, like a vacuum hose? Yes, I'm talking out of my ass because I don't know about this stuff.
My car did this when I got a new flywheel.. I had to raise the RMPs of the idle. Otherwise it may be a MAF issue.
check/clean your MAF. Clean/check your idle air control unit.
New info: it seems to be directly related to the fans coming on... I was sitting in my car eating lunch. It would idle fine around 500 rpm until the fan kicked in... then it had trouble. It even stalled out once. It was idling in neutral.
If you have a multimeter you can check the battery and alternator voltage.If not get them both tested.Also check the belt tension for the alternator.You should be idling more like 750 rpm than 500rpm.Maybe you IAC valve does need cleaning.Don't know what to tell you.I could go on all day but you not being mechanically inclined with cars doesn't help.Are you still under warranty?
Actually, I'm mechanically inclined just haven't really messed with cars... especially the ones whose engines look like spaghetti messes
So I can take a look. And I've got knowledgeable friends too. And I have a multimeter as well!
I've got just under 50k on it, so the drivetrain is covered until 60 but I figured this probably wouldn't fall under the warranty.
Think I've got it fixed... cleaned what I believe is the MAF (right behind the air filter?) and it seems to be idling much better - it's idling around 1000 rpm and raising a bit more (and holding pretty steady) when the radiator fan or AC come on.
It had some carbon deposit on it... I bought some cleaner and I think that solved it. Thanks guys!
(wish I hadn't removed the alternator first but live and learn)